In 1965 Hassan was named as Crown Prince of Jordan after the constitution was amended.[3] He was frequently regent during his brother's absences from the country. During Hussein's final illness in January 1999, he was replaced by his nephew Abdullah only days before the king died.[4] Abdullah subsequently inherited the throne of Jordan.

The following includes some of the organizations that Prince Hassan belongs to and/or founded.

Member of the:

Global Leadership Foundation, an organization which works to support democratic leadership, prevent and resolve conflict through mediation and promote good governance in the form of democratic institutions, open markets, human rights and the rule of law. It does so by making available, discreetly and in confidence, the experience of former leaders to today’s national leaders. It is a not-for-profit organization composed of former heads of government, senior governmental and international organization officials who work closely with Heads of Government on governance-related issues of concern to them.

Chairman the United Nations Secretary-General's Advisory Board on Water and Sanitation (UNSGAB), June 2013 -.

In June 2003, following the U.N. General Assembly resolution 56/266, Hassan was elected as one of five regional experts in the Independent Eminent Experts group, appointed by the Secretary-General of the United Nations, to implement the Declaration and Programme of Action of the World Conference against Racism, Racial Discrimination, Xenophobia and Related Intolerance that took place in Durban, South Africa, in 2001.

In 2002, Prince Hassan was awarded an honorary doctorate by the University of York, in recognition of his contribution to the field of post-war reconstruction and development.[10] In 2004 he was awarded an honorary fellowship by York St John University, for his lifelong contribution to peace initiatives in the Middle East, humanitarian projects and inspirational leadership in interfaith dialogue.

"Honouring the President Emeritus of the World Conference of Religions for Peace underlines Prince Hassan's courage in defending pluralism, promoting understanding among different cultures and enhancing dialogue between Jews, Muslims and Christians. The Prince's efforts to promote understanding between the Islamic and Western Worlds are crucial at a time when we seem to be drifting apart, with perceived differences appearing to overwhelm the many things we have in common, both culturally and religiously."[13]

The 2005 Eternal Flame Award by the Annual Scholars’ Conference of the U.S.

The Calgary Peace Prize – 2007.

A medal to commemorate the 60th anniversary of the adoption of UNESCO's Constitution, at the inaugural meeting of the Tolerance Foundation held at the Yusupov Palace, St. Petersburg, Russia – May 2007.